Dog bed



FIG. 1 is a perspective view of a dog bed showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a left elevation view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures illustrate portions of the dog bed that form no part of the claimed design. 

CLAIM The ornamental design for a dog bed, as shown and described. 